10 Best Conventional Window Air Conditioners with Auto Restart of 2026
Conventional window ACs with auto restart recover your cooling settings after a power outage. These models balance reliable performance with essential features for straightforward climate control.
By Daniel Brooks
Updated October 7, 2026
Conventional window air conditioners with auto restart provide reliable, uninterrupted cooling, automatically restoring your settings after a power outage. This feature is essential for maintaining comfort during summer storms and ensuring your space stays cool without manual intervention. Our guide is designed for homeowners, renters, and anyone seeking a dependable cooling solution that prioritizes convenience and consistent performance. We compared models based on their cooling power, noise output, control options, and installation requirements to identify the best options across various room sizes. For more options with advanced controls, see our guide on window air conditioners with digital controls.
When evaluating these units, we focused on specifications that impact real-world usability. The auto restart function is a key differentiator, but we also considered factors like energy efficiency modes, remote control availability, and filter maintenance alerts. Whether you need to cool a compact bedroom or a large living area, this roundup includes a range of BTU capacities to match your specific needs. Each product was assessed using manufacturer specifications to ensure accurate comparisons of cooling coverage, sound levels, and feature sets.
All Products Compared
| Product | Best For | Cooling Capacity | Room Size | Noise | Notable Feature |
|---|---|---|---|---|---|
| Frigidaire 5,000 BTU Window Air Conditioner | Small rooms, bedrooms | 5,000 BTU | Up to 150 sq. ft. | 52 dBA | Effortless Temperature Control |
| LG LW8024RD 8,000 BTU Window AC | Medium rooms | 8,000 BTU | Up to 350 sq. ft. | 53 dB (low) | 4-way air deflection |
| Frigidaire 8,000 BTU Window Air Conditioner | Medium rooms with remote | 8,000 BTU | Up to 350 sq. ft. | 54 dBA | 6-way directional airflow |
| Amana 12,000 BTU Window Air Conditioner with 3 | Large rooms | 12,000 BTU | Up to 550 sq. ft. | Not listed | 8-way directional louvers |
| GE 5,000 BTU Window Air Conditioner | Budget small spaces | 5,000 BTU | Up to 150 sq. ft. | 52 dBA (low) | Simple mechanical controls |
| LG LW1424RD 14,000 BTU Window Air Conditioner | Medium to large rooms | 14,000 BTU | Up to 800 sq. ft. | Not listed | Slide-out washable filter |
| LG 18,000 BTU Window Air Conditioner with Heat | Year-round climate control | 18,000 BTU | Up to 1,000 sq. ft. | Not listed | Heating and cooling |
| LG 24,500 BTU Smart Window Air Conditioner | Very large rooms, smart homes | 24,500 BTU | Up to 1,560 sq. ft. | 50 dB (low) | LG ThinQ smart controls |
| Whirlpool 15,000 BTU Window Air Conditioner | Large rooms with high humidity | 15,000 BTU | Up to 700 sq. ft. | Not listed | 3.5 pints/hr dehumidification |
| LG 6,000 BTU Window Air Conditioner | Compact medium rooms | 6,000 BTU | Up to 250 sq. ft. | 52 dB (low) | Auto Cool setting |
| Award | Product | WikiCooling Score About WikiCooling ScoreThe WikiCooling Score is our own rating from 0 to 10, based on the criteria described on our How We Review page. It reflects research, not laboratory measurement, and is never influenced by manufacturers, retailers, or affiliate commissions. Learn more › | |
|---|---|---|---|
| Best Overall |
Frigidaire 5,000 BTU Window Air Conditioner
|
8.3/10 | Buy |
| Best Value |
LG LW8024RD 8,000 BTU Window AC
|
8.3/10 | Buy |
GE 5,000 BTU Window Air Conditioner
|
7.6/10 | Buy | |
| Best Budget |
Frigidaire 8,000 BTU Window Air Conditioner
|
8.3/10 | Buy |
Amana 12,000 BTU Window Air Conditioner
|
8.3/10 | Buy | |
LG LW1424RD 14,000 BTU Window Air Conditioner
|
7.5/10 | Buy | |
| Best Premium |
LG 24,500 BTU Smart Window Air Conditioner
|
7.5/10 | Buy |
LG 18,000 BTU Window Air Conditioner with Heat
|
7.5/10 | Buy | |
Whirlpool 15,000 BTU Window Air Conditioner
|
7.3/10 | Buy | |
LG 6,000 BTU Window Air Conditioner
|
7.2/10 | Buy |
Frigidaire 5,000 BTU Window Air Conditioner
This Frigidaire window air conditioner cools rooms up to 150 sq. ft. with 5,000 BTU. It operates quietly at 52 dBA and features two fan speeds and effortless temperature control. Ideal for small bedrooms or living spaces.
Pros
- Quiet operation at 52 dBA
- Easy-to-clean washable filter
- Auto restart feature
- Adjustable side panels for fit
- Two fan speeds for customization
Cons
- No inverter compressor
- Manual button controls only
- Heavy at 35.3 pounds
LG LW8024RD 8,000 BTU Window AC
For medium-sized rooms up to 350 square feet, this LG window air conditioner combines quiet operation with practical features. Its 4-way air deflection and three cooling speeds allow customized airflow, while the auto restart function ensures comfort after power outages. The included remote and washable filter add convenience, making it a solid choice for bedrooms or living areas.
Pros
- Quiet operation as low as 53 dB
- Auto restart after power outage
- Washable filter for easy maintenance
- Remote control included
- 4-way air deflection for targeted cooling
Cons
- No inverter technology (on/off compressor)
- Moderate energy efficiency (SEER 11.4)
- Heavy unit at 57 pounds
GE 5,000 BTU Window Air Conditioner
A budget-friendly window AC for small spaces up to 150 square feet, this GE unit uses simple mechanical controls and two cooling modes. It operates quietly at 52-56 dBA, making it suitable for bedrooms and dorm rooms. Easy DIY installation fits double-hung windows 27 to 36 inches wide.
Pros
- Quiet operation at 52-56 dBA
- Easy mechanical controls, no setup
- Washable filter, low maintenance
- Low power draw at 440 watts
- Fits narrow windows down to 27 inches
Cons
- Fits only double-hung windows
- No smart or remote control features
- May need wider side panels for extra-wide windows
Frigidaire 8,000 BTU Window Air Conditioner
With 8,000 BTU of cooling power and coverage for up to 350 sq ft, this Frigidaire window AC suits small bedrooms and compact living spaces. It includes three fan speeds, 6-way airflow, Eco Mode, Sleep Mode, and a washable filter. The 55 db noise level and remote control make it a practical mid-range choice for everyday cooling.
Pros
- Covers rooms up to 350 sq ft
- Three fan speeds and 6-way airflow
- Eco Mode and Sleep Mode save energy
- Washable filter has cleaning reminders
- Remote control and 24-hour timer
Cons
- Washable filter requires periodic maintenance
Amana 12,000 BTU Window Air Conditioner
This Amana window unit delivers 12,000 BTUs of cooling for rooms up to 550 square feet, making it a solid choice for medium-sized living spaces. It offers three cooling speeds, eco mode, and a programmable 24-hour timer for flexible comfort. The 60 dB noise level and reciprocating compressor are typical for this class, while the washable filter and auto restart add convenience.
Pros
- Covers rooms up to 550 sq ft
- Three cooling speeds plus eco and sleep modes
- Auto restart after power outage
- Washable filter with clean alert
- Remote control included
Cons
- Heavy at 72.8 pounds
- Reciprocating compressor, not inverter
- Noise level of 60 dB
LG LW1424RD 14,000 BTU Window Air Conditioner
Designed for medium to large rooms up to 800 sq ft, this LG window unit delivers 14,000 BTUs of cooling power with three cooling and fan speeds. Its auto restart and 24-hour timer provide scheduling flexibility, while the removable washable filter and check filter alert simplify maintenance. The included remote and 4-way air deflection add convenience.
Pros
- 14,000 BTU capacity for large rooms
- Auto restart after power outage
- Washable filter with check alert
- Remote control with 24-hour timer
- 4-way air deflection
Cons
- Heavy at 82 pounds
- No heat mode (cooling only)
- Noise level of 59 dB
LG 24,500 BTU Smart Window Air Conditioner
For large spaces up to 1,560 sq ft, this LG window unit delivers 24,500 BTUs of cooling power with smart home integration. It offers app and voice control via LG ThinQ, three cooling and fan speeds, and 4-way air deflection for targeted airflow. Best suited for large bedrooms, living rooms, or apartments with a 230V outlet.
Pros
- Smart control via LG ThinQ app and voice
- Cools large rooms up to 1,560 sq ft
- 4-way air deflection for targeted airflow
- Auto restart after power outage
- Easy-clean washable filter with reminder
Cons
- Requires 230V outlet, not standard 115V
- Heavy at 132 pounds, difficult to install alone
- No inverter technology for variable speed
LG 18,000 BTU Window Air Conditioner with Heat
This window unit from LG combines cooling and supplemental heat for year-round comfort in medium rooms up to 1,000 square feet. It runs on 230/208V, offers two speeds and a 24-hour timer, and includes a remote and washable filter. A practical choice for bedrooms, living rooms and apartments where a single unit must handle both seasons.
Pros
- Heating and cooling in one unit
- Covers 1,000 square feet
- Remote control included
- Auto restart after power loss
- Washable filter
Cons
- Non-inverter compressor
- Heavy at 126 pounds
- Requires 230/208V outlet
Whirlpool 15,000 BTU Window Air Conditioner
Capable of cooling rooms up to 700 square feet, this Whirlpool window unit also removes 3.5 pints of moisture per hour. Its 56 dB noise level is moderate, and the included remote and 24-hour timer add convenience. Best for large bedrooms or living spaces where dehumidification is also needed.
Pros
- Cools up to 700 sq. ft.
- Built-in dehumidifier
- Remote and 24-hour timer
- Filter maintenance reminder
- Auto restart feature
Cons
- 56 dB noise level may be noticeable
- SEER 11.9 is not the most efficient
- Requires window height of at least 19 inches
LG 6,000 BTU Window Air Conditioner
The LG LW6024R window air conditioner is a 6,000 BTU unit designed to cool rooms up to 250 square feet, making it suitable for medium bedrooms and small living areas. It offers two cooling and fan speeds, a 24-hour timer, and auto restart for convenience. With noise levels as low as 52 dB, it operates quietly, though some users note it can be somewhat noisy.
Pros
- Quiet operation at 52 dB on low mode.
- Auto Restart after power failure.
- Easy installation with included trim kit.
- Remote control and 24-hour timer.
- Washable filter with check filter alert.
Cons
- No inverter compressor for variable speed.
- Noise level may be higher than some expect.
- Eco mode only raises temperature setpoint.
Top 3 Conventional Window Air Conditioners with Auto Restart Reviewed
#1 Frigidaire 5,000 BTU Window Air Conditioner: Best Overall
Why We Picked It
The Frigidaire 5,000 BTU Window Air Conditioner earns the top spot for its proven reliability, quiet operation, and comprehensive feature set tailored for small spaces. Its 5,000 BTU cooling capacity is precisely matched for rooms up to 150 square feet, such as bedrooms or home offices, ensuring efficient cooling without excess energy use. The unit’s auto restart function is a core component of its design, working in tandem with Effortless Temperature Control to maintain a consistent preset environment automatically after any power interruption.
We compared it against other models and found its combination of a 52 dBA noise rating and user-friendly features like a washable filter and extended power cord provides exceptional value. While other picks offer more cooling power or smart features, this Frigidaire model delivers a balanced, no-fuss cooling solution where the auto restart feature acts as a reliable safeguard. Its high volume of positive buyer ratings underscores its performance in real-world conditions, making it a dependable choice for those prioritizing quiet, automated comfort in compact areas.
Key Specifications
- Cooling Capacity: 5,000 BTU
- Room Size: Up to 150 sq. ft.
- Noise Level: 52 dBA
- Fan Speeds: 2
- Features: Auto Restart, Effortless Temperature Control, Washable Filter
| Pros | Cons |
|---|---|
|
|
Things to Consider
This unit is specifically designed for small spaces, so verifying your room size is crucial before purchase. Its 5,000 BTU output would be insufficient for larger areas. The installation requires a standard 115V outlet and fits double-hung windows within a typical range, but you should measure your window opening to confirm compatibility. While it lacks a remote, its front-panel controls are straightforward for manual operation.
Best For
This air conditioner is best for individuals cooling a single small bedroom, dorm room, or studio apartment where quiet, reliable performance and automatic recovery from power loss are top priorities. It suits renters or homeowners who want a simple, effective cooling solution without complex programming.
For a dependable and quiet cooling solution for small spaces, consider the Frigidaire 5,000 BTU Window Air Conditioner.
#2 LG LW8024RD 8,000 BTU Window AC: Best for Medium Rooms
Why We Picked It
The LG LW8024RD 8,000 BTU Window AC is selected for its optimal balance of cooling power, feature-rich operation, and quiet performance for medium-sized rooms. Its 8,000 BTU capacity effectively covers areas up to 350 square feet, making it versatile for living rooms or master bedrooms. The auto restart function is seamlessly integrated, ensuring the unit resumes its previous cooling mode and temperature setting automatically, which is particularly valuable in areas prone to brief power fluctuations.
Compared to the top pick, this LG model steps up in capacity and adds convenient electronic controls and a remote. Its 4-way air deflection and three fan speeds offer superior customization of airflow direction and intensity. The low noise operation starting at 53 dB means it won’t disrupt activities or sleep, even when running in a common living area. This combination of expanded cooling range, user convenience, and the security of auto restart makes it a standout choice for those needing more power without sacrificing comfort or control.
Key Specifications
- Cooling Capacity: 8,000 BTU
- Room Size: Up to 350 sq. ft.
- Noise Level: 53 dB (low mode)
- Fan Speeds: 3 cooling & fan speeds
- Features: Auto Restart, 24-hour timer, Remote Control, 4-way air deflection
| Pros | Cons |
|---|---|
|
|
Things to Consider
Ensure your window can accommodate the unit’s physical dimensions for a secure installation. It operates on 115V, but it’s wise to confirm your circuit can handle the load, especially if other appliances are on the same line. The 350 sq. ft. coverage is a general guideline; rooms with high ceilings, significant sunlight, or multiple occupants may require reassessment.
Best For
This model is best for homeowners or renters needing to cool a living room, larger bedroom, or open-plan area up to 350 sq. ft., and who value the convenience of remote control operation alongside the assurance of auto restart.
To cool a medium room with advanced features, explore the LG LW8024RD 8,000 BTU Window AC.
#3 GE 5,000 BTU Window Air Conditioner: Best Value
Why We Picked It
The GE 5,000 BTU Window Air Conditioner is chosen as the best value for its straightforward, cost-effective approach to delivering essential cooling with auto restart. It matches the top pick’s cooling capacity for spaces up to 150 sq. ft. but utilizes simple mechanical controls, which can be preferable for users who favor dials over digital interfaces. Its auto restart function provides the same crucial benefit of automatic recovery, ensuring basic comfort is maintained without user intervention after a power outage.
We evaluated this unit against others and found it delivers reliable core performance at a more accessible price point. It offers two cooling modes with low noise levels (52 dBA on low setting), making it suitable for nighttime use in bedrooms. The trade-off for the lower cost is the absence of a remote control and some advanced features like programmable timers found on the other picks. However, for buyers seeking a no-nonsense, budget-friendly unit that still includes the practical auto restart feature, this GE model represents significant utility and value.
Key Specifications
- Cooling Capacity: 5,000 BTU
- Room Size: Up to 150 sq. ft.
- Noise Level: 52 dBA (low), 56 dBA (high)
- Cooling Modes: 2
- Features: Auto Restart, Mechanical Controls, Washable Filter
| Pros | Cons |
|---|---|
|
|
Things to Consider
This unit’s mechanical controls mean all adjustments must be made at the unit itself. Confirm that your window dimensions fall within the specified range (27.125″, 36″ wide, 13.375″ high minimum) for proper installation. Like all 5,000 BTU models, it is intended for small rooms only; using it in a larger space will strain the unit and reduce its effectiveness and efficiency.
Best For
This air conditioner is best for budget-conscious buyers, students, or renters who need effective cooling with auto restart for a small room and prefer the simplicity and reliability of manual controls over digital features.
For an economical and simple cooling unit with auto restart, check the GE 5,000 BTU Window Air Conditioner.
How to Choose a Conventional Window Air Conditioner with Auto Restart
Match Cooling Capacity to Your Room
Selecting the correct BTU (British Thermal Unit) rating is the most critical step. An undersized unit will run constantly without cooling the room effectively, while an oversized unit will cool too quickly without properly dehumidifying, leading to a cold but clammy environment and inefficient short cycling. Use the ENERGY STAR sizing chart as your primary guide, then adjust based on your room’s specific conditions like sunlight exposure and occupancy.
ENERGY STAR publishes this general guide for sizing a room air conditioner by floor area:
| Room Size (sq ft) | Cooling Capacity (BTU/hr) |
|---|---|
| 100 to 150 | 5,000 |
| 150 to 250 | 6,000 |
| 250 to 300 | 7,000 |
| 300 to 350 | 8,000 |
| 350 to 400 | 9,000 |
| 400 to 450 | 10,000 |
| 450 to 550 | 12,000 |
| 550 to 700 | 14,000 |
| 700 to 1,000 | 18,000 |
Adjust for your room: reduce capacity by 10 percent for a heavily shaded room, increase it by 10 percent for a very sunny room, add 600 BTU for each regular occupant beyond two, and add 4,000 BTU if the unit cools a kitchen. Source: ENERGY STAR.
Window Fit and Installation
A proper fit is essential for safety, efficiency, and preventing air leaks. Before purchasing, carefully measure the height and width of your window opening and compare it to the unit’s required minimum and maximum window dimensions listed in the specifications. Most units include an installation kit with expandable side panels and weather stripping. Ensure the window can support the unit’s weight and that you can secure it according to the manual’s instructions to prevent accidents.
Noise and Inverter Compressors
Noise level, measured in decibels (dB or dBA), significantly impacts comfort, especially in bedrooms or quiet living spaces. Look for the sound rating for the unit’s low or quiet mode. Conventional units with auto restart typically use fixed-speed compressors, which cycle on and off at full power, causing more noticeable sound fluctuations. While none of the models in this guide are inverter-driven, understanding that technology’s benefit, quieter, more efficient variable-speed operation, helps frame your expectations for the sound profile of a standard window AC.
Energy Efficiency and Operating Modes
While CEER (Combined Energy Efficiency Ratio) ratings are not always listed, look for energy-saving features that reduce power consumption. Eco Mode automatically adjusts the compressor and fan to maintain temperature with minimal energy use. Sleep Mode gradually increases the temperature overnight to match your body’s natural cooling and save energy. Dry Mode focuses on dehumidification without excessive cooling. These modes, combined with a properly sized unit, help manage operating costs. For more on efficiency, see our guide on window air conditioners with energy saver modes.
Controls and Smart Features
Control options range from basic mechanical dials to electronic panels with remotes and smart home integration. Mechanical controls are simple and reliable but require you to be at the unit to make changes. Electronic controls with remotes offer convenience for adjusting settings from across the room. Some advanced models include Wi-Fi connectivity, allowing control via smartphone apps or voice assistants. Consider which interface best suits your lifestyle. The auto restart feature works across all these control types, reactivating the last used settings regardless of how they were originally set.
How We Evaluate
Our evaluation is based on a thorough analysis of manufacturer specifications, product listing information, and aggregated buyer ratings. For this guide on conventional window air conditioners with auto restart, we prioritized the presence and integration of the auto restart feature as a fundamental requirement. We then weighed each unit’s cooling capacity against its stated room size coverage to ensure honest performance claims. Additional factors included noise levels for livability, the convenience of control options (remote, digital, mechanical), ease of maintenance via filter alerts, and overall value within its capacity category.
Our recommendations are formed by comparing verified data points across all listed products. It is essential for buyers to confirm the specific cooling capacity, electrical requirements (voltage and amperage), and exact window size compatibility for their chosen model before purchase, as these are critical for safe and effective operation.
Frequently Asked Questions
What is auto restart and why is it important?
Auto restart is a function that automatically powers the air conditioner back on and resumes its previous settings after a power outage. This is important because it maintains your cooling comfort without requiring you to manually reset the unit. It is particularly valuable during summer storms or in areas with unreliable power, ensuring your room returns to a comfortable temperature as soon as electricity is restored.
How do I know what size air conditioner I need?
Use the ENERGY STAR sizing chart as a starting point, matching your room’s square footage to the recommended BTU capacity. For example, a room between 300 and 350 square feet generally requires an 8,000 BTU unit. Remember to adjust this base number: add 10% for very sunny rooms, subtract 10% for heavily shaded rooms, and account for additional occupants or if the room is a kitchen. Always choose the closest capacity without going significantly under or over.
Can I install a window air conditioner myself?
Most window air conditioners are designed for DIY installation and come with a mounting kit. The process typically involves securing the bracket, placing the unit, expanding the side panels, and sealing gaps. However, you must follow the manual precisely, ensure the window is structurally sound to hold the weight, and confirm you have the correct electrical outlet. Units over 115V or with heating functions, like the LG 18,000 BTU model, may require a special outlet installed by a qualified electrician.
Are these air conditioners quiet enough for a bedroom?
Many models are designed with bedroom use in mind. Look for the listed noise rating in decibels (dB or dBA) for the unit’s low or quiet mode. For instance, the Frigidaire 5,000 BTU unit operates at 52 dBA, and the GE 5,000 BTU model has a low setting of 52 dBA, which is considered quiet for sleep. Models with higher BTU ratings for larger rooms may have slightly higher noise levels, so check the specifications if low noise is a priority.
Do I need a special electrical circuit for a window AC?
It depends on the unit’s voltage and amperage. Most standard models under 12,000 BTU use 115V and should be plugged into a dedicated outlet, not shared with other high-power appliances, to prevent overloading the circuit. Larger capacity units, like the 24,500 BTU LG smart AC or the 18,000 BTU LG with heat, require a 230/208V outlet, which is not standard in all homes and likely requires professional installation. Always check the product’s listed electrical requirements before purchase.
Final Verdict
The Frigidaire 5,000 BTU Window Air Conditioner stands as our best overall choice for its proven reliability, exceptionally quiet operation, and well-rounded feature set including Effortless Temperature Control and auto restart, making it ideal for small bedrooms. For those needing to cool a larger living area or medium-sized room, the LG LW8024RD 8,000 BTU Window AC offers superior cooling power, convenient remote control, and multiple airflow settings while maintaining quiet performance. Budget-focused buyers seeking core cooling with auto restart should consider the GE 5,000 BTU Window Air Conditioner for its straightforward operation and value.
The key consideration when choosing among these models is accurately matching the unit’s BTU capacity to your room size. An appropriately sized air conditioner with auto restart will not only cool efficiently but also provide peace of mind, automatically restoring your comfort after any power interruption. Always verify window dimensions and electrical requirements to ensure a safe and successful installation.
About the author
Daniel Brooks is a home cooling editor at WikiCooling, covering window, portable, through-the-wall and mini-split air conditioners, fans, and dehumidifiers. He researches cooling capacity, energy efficiency, noise levels, installation requirements, and buyer feedback to help homeowners choose the right unit for their room size, climate, and budget.